Azo dyestuffs containing chromium and process of making same



Patented 7 Mar. 29, 1927.

UNITED STATES 1,623,005 PATENT OFFICE.

HANS GUBLER, HERMANN STAHEL, AND FRITZ STRAUB, OF BASEL, SWITZERLAND, AS- SIGNORS TO THE FIRM SOCIETY. OF CHEMICAL INDUSTRY IN BASLE, OF BASEL,

SWITZERLAND.

AZO DYE S TUFFS CONTAINING CHROMIUM AND PROCESS OF MAKING SAME.

No Drawing. Application filed June 21, 1926, Serial No. 117,615, and in Switzerland July 3, 1825.

The present invention relates to new 2120- dyestufi's containing chromium; it comprises the new dyestufl's, the process of making same. and the material dyed with the new dyestuffs.

The first step of the manufacture of the named dyestuffs consists in the preparation of unsulphonated ortho-hydroxy-azo-dyestufi's of the general formula wherein R, represents a benzene nucleus containing at least one OH-group in ortho-position to the azo bridge and R the residue of a. 1-pheuyl-5-pyraz0lone to which the azo bridge is attached in 4-position and in which general formula at least one of the aromatic nuclei of the residues R, and R contains at least one sulphamide group SO. .-NH. The second step consists in the preparation of the dyestufl's containing chromium by treating the new ortho-hydruxy-azo-dyest'ufi's of the above general formula with compounds of the trivalent,chromium such as chromium hydroxide or oxide or the salts which these compounds fOl'll'l. with acids or caustic alkalies. As agents yielding chromium there may be employed also salts of chromic acid, these compounds being transformed during the process into derivatives of the trivalent chromium.

The new azo-dyestufi's obtained by the first step of the process are dyestufls ada ted to be chromed, the dyestufi's containing 0 romiuni of the second step of the process are acid dyestuti's dyeing the animal fibre in an acid bath orange tints. They form orangebrown to brown powders, dissolving in water and in caustic soda solution of 10% strength to orange, in concentrated sulphuric acid to yellow solutions, dyeing wool in an acid bath orange tints of good properties of fastness. The dyeings are distinguished by remarkable pro ierties of tastness and an excellent levelling power. The fastness to falling and to light of the dyeings obtained on loose wool or cardings are particularly good.

As l-phenyl-5-pyrazolones there come into consideration above all tlrepyrazolones described in the United States Patent No. 1.534.512, further the pyrazolones which may be obtained from uusulphonated aromatic amines, such as aniline, the toluidines, the

aminophenol and aminocresol ethers and their halogen substitution products, or from the corresponding hydrazines and from an aceto acetlc acid ester or an oxal acetic acid ester. As diazotization components there come into consideration, inter alia, the amides described in the French Patent No. 490177 and the simple ortho-aminophenols, as for Instance the chloro and the nitroam nophenols or eresols. The manner in which the chromium is bound to the dyestuffs is not known.

The following examples illustrate the invention, the parts being by Weight:-

Example I parts of 6-nitro-2-amino-1-hydroxybenzene-4-sulphamide are dissolved in 600 parts of water and 150 parts of hydrois salted out and isolated in the usual manner.

It dyes wool in an acid bath yellow red tints, which chan e towards orange when after-chromed. T 1e G-nitro-Q-amino-l-hvilroxybenzene l-sulphamide used in this example may be made as follows 188 parts of finel ground .l-amino-l-hydroxybenzeneA-sulpiiamide are introduced, while stirring and at a temperature between 30 and 40 G. into 752parts of sulphuric acid of 66 B. Stirring is continued until solution is complete; the solution is cooled to ,5 C. and'there are dropped into it, at a temperature of -5 to 0 (1., 130 parts of :1V

'inixture of nitric acid and sulphuric acid lltl lltl

containing 48.6 per cent HNO After this addition is complete the mixture is maintained for some time longer at a low temperature, then poured upon 2000 parts of ice and neutralised with milk of lime, the temperature not being allowed to rise above (3.; the mass is then filtered from calcium sulphate and the calcium salt is transformed into the sodium salt. The solution thus obtained may be used directly for the manufacture of the dyestutl. The 6-nitro-2- amino-l-hydroxybenzene-4-sulphamide is freely soluble in Water and alcohol and sparingl soluble in ether. When once recrystallize from alcohol it melts at 191 C.

Ewamplc 188 parts of EZ-amino-1hydroxyhrmzene-4- sulphaniide are dissolved in (300 parts of Water and 150 parts of hydrochloric acid of 30 per cent strength. The solution is diazotized at 5 C. with 69 parts of sodium nitrite and then stirred in an ice-cold solution of 253} parts of l-(;l-sulphamido)- plien ifi-metliyhS-pyrazolone, kept alkaline with sodium carbonate. When the reaction is finished the dyestutl' cmrespoiuling with the formula C H H l SOsNHfi :N b t t *0 min 302N551 Ha which has completely separated, is filtered. solution in water at 85-00 C. and re crystallization it can be puritied.

In like manner there may he obtained a dyestuil from -l nitro-3*aminod-hydroxybenzene and 1-(3'-sul}.)hamido)-phenyl-3- methyl-5-pyrazolone or ]1.-( Y-sulphamido) phenyl-5-pyrazolone-fi-carboxylic acid.

imam pic i.

45.2 parts of the azoalyestult from 2 amino-1 hydroxyhcnzenc l sulphainide and l- (3-sulphamido -phc11yl-il-lnctli)l'5" pyrazolone are dissolved in louo parts of boiling water, and the solution is mixed with a solution of chromium for-mate corresponding with 15.2 parts of (111.0 the whole being boiled for a long time in a reflux apparatus. The chromium compound is isolated by suiting out. It is an orange brown powder, soluble in water to an orange solution, in caustic soda solution of 10 per cent, strength to an orange solution and in concentrated sulphuric acid to a yellow solution; it dyes wool in an acid hath orange tints with good properties of fastncss.

Example .4.

45.2 parts of the azo-dyestutl from 2 ammo-1 hydroxyhenzene 4 sulphannde and 1- (3-sulphamido) -plrcnyl-fl-methyl-S- pyrazolone are dissolved in. 1000 parts of boiling water. The solution is mixed with an aqueous solution of sodium chromate corresponding with 9.5 parts of 0150 and 52.8 parts of ammonium sulphate and the Whole is boiled in a reflux apparatus until no further change of colour is detected in the solution. The chromiferous dyestutl" is then isolated by salting out. It is similar to the dyestutl of the preceding example. With alkali metal chromites, one obtains a similar dyestuli.

E mample 5.

49.7 parts of the dycstutl from G-nitro-Q- amino-l-lrydroxybenzcnet-sulpliamide and 1-phenyl-3-methyl-5-pyrazoione are dissolved in 500 parts of hot water and the solution is mixed with one of chromium acetate corresponding with 15.2 parts of @130 and the whole is boiled for a long time in. a reflux apparatus.

The chromium compound is obtained by salting out. it is an orange brown powder, soluble in water to an orange solution, in caustic soda solution of 10 per cent strength to an orange solution and in concentrated sulphuric acid to a yellow solution; it dyes wool in an acid bath orange tints having good properties of fastness.

Example 6.

A paste of hydrated chromium oxide containing -10 parts of water and corresponding with 8.5 parts of C130 24 parts of canstic potash and 1) parts of glycerin is heated until the whole is dissolved, whereupon 150 parts of water are uddcd: 48.2 parts of the dycstutl' from Q-zuuiuod-hydroxyhenzene-dsulphamide and l(LV-sulphamido)-phenyl- 3-carhoxyl-5-pyrazolone are added to the solution and the whole is boiled in a reflux apparatus until lll lltilfi no further change in the colour of the solution. Water is now added and the liquid is made neutral by mean ol mineral acid and the dyestutl is salted out, tiltered and dried. it is a brown powder which dissolves in water to an orange solution, in caustic soda solution of 10 per cent. strength to an orange solution and in concentrated sulphuric acid to a yellow solution. it dyes wool in an acid hath orange tints of good properties of fastne' s.

\Vhat we claim is:

1. As a step in the process of making acid azo-dyestutl's containing chromium the preparation ol unsulphonatcd ohydrorvazo dyestutl's corrcspoinling with the gen cral formula wherein R, represents a benzene nucleus containing at lea t one Oil-group in orthoposition to the azo bridge and R the residue of a 1-phenyl-5-pyrazolone to which the azo bridge is attached in 4-position, by coupling an unsulphonated ortho-hydroxy-azo-compound of the benzene series with an unsuiphonated 1-phenyl -5-pyrazolonethese components being such that at least one of them contains at least one sulphamide group SO NH 2. As a step in the proce's of making acid azo'dyestuti's containing chromium the preparation of unsulphonated ortho-hydroxyazo-dyestuffs corresponding with the general formula wherein R represents a benzene nucleus containing at least one OH-group in orthoposition to the azo bridge and R the residue of a i-pheny1-3-methyl-5-pyrazolone to which the azo bridge is attached in i-position, by coupling an unsulphonated orthohydroxy-azo-compound of the benzene series with an unsulphonatcd 1-phenyl-3-inethyl- 5-pyrazolone these components being such that at least one of them contains at least one sulphamide group S() NH 3. As a step in the proces of makingacid azo-dyestutls containing chromium the preparation o't' unsulphonated ortho-hvdroxyazo-dyestuii's corresponding with the general formula R N zN R by coupling the diazotized Q-amino-l-hydroxybenzenetsulphamide with the 1-(3- sulphamido) -phenyl-3-niethyl-5-pyrazolonc. 5. As a step in the process of making acid azoalycstutfs containing chromium the herein described treatment ofthe dyestuffs corresponding with the general formula R --N:N-R wherein R represents a benzene nucleus containing at least one OH-group in orthoposition to the azo bridge and R the resi due of a l-phenyl-ii-pyrazolone to which the azo bridge is attached in 4-po=ition and wherein at least one of the residues R and R contains at least one group S() NH with compounds of trivalent chromium.

6. As a step in the process of making acid azo-dyestulis containing chromium the here-- in described treatment of the dyestuti' corre spending with the general formula wherein R represents a benzene nucleus containing at least one Oil-group in orthoposition to the azo bridge and R the residue of a l-phenyl-b-pyrazolone to which the azo bridge is attached in 4-position and wherein at least one of the residues R and R contains at least one group --'S() NH. with trivalcnt salts of chromium.

7. As a step in the process of making acid azo-dyestufi's containing chromium the here in described treatment. of the dyestuti' corresponding with the general forn'nila wherein R represents a benzene nucleus containing at least one ()l-l-group in orthoposition to the azo bridge and R the residue of a l-phenyl-3-methyl-5-pyrazolone to which the azo bridge is attached in t-position and wherein at least one of the residues R and R contains at least one group --i() NH with trivalent salts of chromium. 8. As a step in the process of making acid azo-dyestuti's containing chromium the herein described treatment of the dyestuft' cor-v responding with the general formula wherein R represents a benzene nucleus con tainin at least: one sulphamide group and an 0' group in ortho-position the azo bridge and R; the residue of a l(3-sulphamide) phenyl I methyl 5 pyrazoione to which the azo bridge is attached in et-position with the trivalent salts of chromium.

9. As a step in the process of making acid azo-dyestufi's containing chromium the herein described treatmentof the dyestuti" corresponding with the formula on n o L A so un Nam. w

501N11 (Ilia with trivalent salts of chromium.

10. As new products the azo-dyestufi's containing chromium;derivatives of the unsulphonated ortho-hydroxy-azo-dyestuEs corresponding with the general'forrmzla wherein R, represents a benzene nucleus containing at least one OH-group in ortho-posltion to the azo bridge and R the residue of a l-phenyl 5pyrazolone to which the azo ln'idge is attached in 4-p0sition and wherein at least one of the residues R, and R contains at least one group -SO HN which products form orange-brown to brown powders, dissolving in Water and in caustic soda solution of 10% strength to orange, in concentrated sulphuric acid to yellow solutionspdyeing wool in an acid bath orange tints of good properties of fastness.

11. As new products the azo-dyestufi's containing chromium, derivatives of the unsulphonated ortho-hydroXy-azo-dyestutls corresponding with the general formula wherein R, represents a benzene nucleus containing at least one OH-gronp in ortho-position to the azo bridge and It the residue of a l-plienyl-3-methyl-5-pyrazolone to which the azo bridge is attached in 4-position and wherein at least one of the residues R, and R contains at least one group -SO NH. which products form orange-brown to hrown powders, dissolving in water and in caustic soda solution of 10% strength to orange, in coinentrated sulphuric acid to yellow solutions, dyeing wool in an acid hath orange tints of good properties of fastness.

12. As new products the azo-dyestutl's containing chromium, derivatives of the unsollionated ortho-hydroxy-azo-dyestutts corresponding with the general formula wherein R represents a benzene nucleus containing at least one sulphamlde group and an OH-gronp in ortho-position to the azo bridge and R the residue of a 1-(3-sulphamide) phenyl 3 methyl 5 pyrazolone to which the azo bridge is attached in Qt-position, which products form orange-brown to brown powders, dissolving in water and in caustic soda solution of 10% strength to orange, in concentrated sulphuric acid to yellow solutions, dyeing wool in an acid hath orange tints of good properties of fastness.

13. As a new product, the azo-dyestufis containin chromium derivative of the ortho hy droxy azo-dyestufl corresponding with the formula which dyestufl' forms an orange-brown powder. dissolving in water and in caustic soda solution of 10% strength to an orange, in concentrated sulphuric acid to a yellow solution, dyeing wool in an acid bath orange tints with good properties of fastness.

l-l. Material dyed with the dyestufl's of claim 1t).

15. Material dyed with the dyestufl's of claim ll.

16. Material dyed with the dyestufis of claim l2.

l7. ltlaterial dyed with the dyestutl's of claim 13.

In witness whereof we have hereunto signed our names this 9th day of June 1926.

HANS GUBLER. HERMANN STAHEL. FRITZ STRAUB. 

